I'm working on a Android VOIP application, I'm using JAIN-SIP API for call setup and RTP to send voice data. Application works fine with one exception which has been troubling me for days: I can't hang up a call with BYE message. I keep getting 481 Call/Transaction Does Not Exist response code from callee. And I don't understand why. So I need someone who is familiar with JAIN-SIP to debug my code and fix this issue for me.
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I am java prgrammer having 5 year of experience. I created java based webphone s for many clients that uses JAIN SIP stact looking forward for this task